Android Design link
How to start designing Android apps in Photoshop & what is a dp?
Range of screens supported
Starting with Android 1.6 (API Level 4), Android provides support for multiple screen sizes and densities, reflecting the many different screen configurations that a device may have. You can use features of the Android system to optimize your application’s user interface for each screen configuration and ensure that your application not only renders properly, but provides the best user experience possible on each screen.
To simplify the way that you design your user interfaces for multiple screens, Android divides the range of actual screen sizes and densities into:
- A set of four generalized sizes: small, normal, large, and xlarge
Note: Beginning with Android 3.2 (API level 13), these size groups are deprecated in favor of a new technique for managing screen sizes based on the available screen width. If you’re developing for Android 3.2 and greater, see Declaring Tablet Layouts for Android 3.2 for more information.
- A set of six generalized densities:
- ldpi (low) ~120dpi
- mdpi (medium) ~160dpi
- hdpi (high) ~240dpi
- xhdpi (extra-high) ~320dpi
- xxhdpi (extra-extra-high) ~480dpi
- xxxhdpi (extra-extra-extra-high) ~640dpi
As you design your UI for different screen sizes, you’ll discover that each design requires a minimum amount of space. So, each generalized screen size above has an associated minimum resolution that’s defined by the system. These minimum sizes are in “dp” units—the same units you should use when defining your layouts—which allows the system to avoid worrying about changes in screen density.
- xlarge screens are at least 960dp x 720dp
- large screens are at least 640dp x 480dp
- normal screens are at least 470dp x 320dp
- small screens are at least 426dp x 320dp
medium-density screens, all the different sizes should be:
- 36×36 (0.75x) for low-density
- 48×48 (1.0x baseline) for medium-density
- 72×72 (1.5x) for high-density
- 96×96 (2.0x) for extra-high-density
- 144×144 (3.0x) for extra-extra-high-density
- 192×192 (4.0x) for extra-extra-extra-high-density (launcher icon only; see note above)
For more information about designing icons, see the Icon Design Guidelines, which includes size information for various bitmap drawables, such as launcher icons, menu icons, status bar icons, tab icons, and more.
Pushpendra Tripathi 